buffet: Anticipate addition of several new DBus facing objects

The draft of DBusManager was written with the idea that only the
DBusManager would expose methods to DBus.  When we add Manager and
Command objects, we're going to need better interfaces to get
ExportedObjects for each now object instance.

BUG=chromium:355387
TEST=Compiles, and `buffet_client --testmethod` still works.

Change-Id: I479b03df0168d1e8305aca1153038fbc8d2ef6c4
6 files changed
tree: a7014eb630c577768d8a1342bd55a4e203ed452d
  1. buffet/